As we all know, going extremely fast in space slows down time. Thus all you need to do is plant some seeds, get on a spaceship that goes much faster than any ship we have built so far, and go into space. When you feel that about 23 hours have elapsed for you, many years will have passed for earth, and you can return to find your beautiful forest fully grown!

You would probably have to talk to dave about how to obtain an orbit fast enough to slow down time so that an hour for you is a year in space, but those are all just details. You may also want to leave someone back on the planet as a guard to ensure a highway bypass is not built through your forest before your return.